diff --git a/cpu/mips32r2_common/include/cpu.h b/cpu/mips32r2_common/include/cpu.h
index 08708b7def..9904991052 100644
--- a/cpu/mips32r2_common/include/cpu.h
+++ b/cpu/mips32r2_common/include/cpu.h
@@ -32,6 +32,14 @@
 extern "C" {
 #endif
 
+/**
+ * @brief   Select fastest bitarithm_lsb implementation
+ * @{
+ */
+#define BITARITHM_LSB_BUILTIN
+#define BITARITHM_HAS_CLZ
+/** @} */
+
 /**
  * @brief   Print the last instruction's address
  *